PVC waste pipe diameters

Is there any good reason why the solvent-weld & push-fit pipes with
the same nominal diameters have different real outside diameters?
(The only reason I can think of is so they can sell more pipe whenever
you switch methods.)

The pipe size is based upon the bore, so different ODs mean different
wall thickness. To me, that suggests that the thicker (at least up to
2"/50mm) solvent weld pipe is rated to a higher pressure than push-fit.
Colin Bignell

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